#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "zlib.h"

#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>
#  include <io.h>
#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#  define SET_BINARY_MODE(file)
#endif

/* Tamanho do buffer usado para passar dados para as rotinas */
#define CHUNK 16384


/*The zlib format has a very small header of only two bytes to identify it as a zlib stream and to provide decoding information, and a four-byte trailer    with a fast check value to verify the integrity of the uncompressed data after decoding.*/


/* report a zlib or i/o error */
void zerr(int ret)
{
    fputs("zpipe: ", stderr);
    switch (ret) {
    case Z_ERRNO:
        if (ferror(stdin))
            fputs("error reading stdin\n", stderr);
        if (ferror(stdout))
            fputs("error writing stdout\n", stderr);
        break;
    case Z_STREAM_ERROR:
        fputs("invalid compression level\n", stderr);
        break;
    case Z_DATA_ERROR:
        fputs("invalid or incomplete deflate data\n", stderr);
        break;
    case Z_MEM_ERROR:
        fputs("out of memory\n", stderr);
        break;
    case Z_VERSION_ERROR:
        fputs("zlib version mismatch!\n", stderr);
    }
}


/* compress or decompress from stdin to stdout */
int main(int argc, char **argv)
{
    int i=0, originalSize, n, ret;
    int *chromossome, compressedSize;
    char c;
    
    //tamanho do cromossomo
    printf("Number of bits: ");
    scanf("%d", &n);
    
    //alocacao do cromossomo
    chromossome = (int *) malloc(n * sizeof(int));
    
    //fflush
    while((c = getc(stdin)) != '\n');
    
    printf("Cromossomo: ");
    //leitura do cromossomo
    while((c = getc(stdin)) != '\n' && i<n){
    	chromossome[i] = c-48;
    	++i;
    }
    
    printf("Cromossomo: ");
    for(i=0; i<n; ++i)
    	printf("%d", chromossome[i]);
    printf("\n");
    
    originalSize = n * sizeof(int);
    printf("Original Size: %d bytes\n", originalSize);    
    
    ret = def(chromossome, originalSize, compressedSize, Z_DEFAULT_COMPRESSION);
    if (ret != Z_OK)
       zerr(ret);
      
    printf("Compressed Size: %d bytes\n", compressedSize);
        
    return ret;
}


/* Compress from file source to file dest until EOF on source.
   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_STREAM_ERROR if an invalid compression
   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
   version of the library linked do not match, or Z_ERRNO if there is
   an error reading or writing the files. */
int def(int *chromossome, int originalSize, int *compressedSize, int level)
{
	int ret, flush;  /*ret will be used for zlib return codes and flush will keep track of the current flushing state for deflate()*/
	unsigned have; /*have is the amount of data returned from deflate()*/
	z_stream strm; /*strm structure is used to pass information to and from the zlib routines*/
	unsigned char in[CHUNK];  /*in is the input buffer for deflate().*/
	unsigned char out[CHUNK];  /*out is the output buffer for deflate().*/

	/* allocate deflate state */
	strm.zalloc = Z_NULL;
	strm.zfree = Z_NULL;
	strm.opaque = Z_NULL;
	ret = deflateInit(&strm, level);
	if (ret != Z_OK)
	return ret;

    	strm.avail_in = originalSize;

	strm.next_in = in;

	strm.avail_out = CHUNK;
	strm.next_out = out;

	ret = deflate(&strm, Z_NO_FLUSH);    /* no bad return value */
	assert(ret != Z_STREAM_ERROR);  /* state not clobbered */

	have = CHUNK - strm.avail_out; /* how much output deflate() provided on the last call: (space provided before the call) - (output space 																available after the call) */
	printf("\nhave: %d\n", have);

	/* clean up and return */
	(void)deflateEnd(&strm);
	return Z_OK;
}
